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.T. S. ALLEN.

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APPLIOATIO! IILEZ) IA! 8, 1911.

Patented July 23, 1912.

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DERRICK.

APPLIQATION FILED HAYS, 1911.

Patented July 23, 1912.

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ALLEN, OI PHILADELPHIA, II'IENII'SYLVANIIIA.

' DERRICK.

Specification of Letters Patent.

Application flied Kay 8, 1911. Serial No. 625,772.

* Patented July23, 1912.

Be it known that I, JAooB- S, Auriga citizen of the United States, residing in Philadelphia, Pennsylvania, have inventedv to reduce the wear of the parts, and to prevent breaking of the lower pivot.

'A further object ot' my invention is to construct the outer end of the' boom so that it will be of greater strength than heretofore, and will provide means for properly guiding the rope which passes around the outer boom sheave.

In the accompanying drawings :-Figure 1, is a side view of my improved derrick; Fig. 2, is a side view,'partly in section, of the foot of the derrick; Fig.- 3 is an enlarged side view of the head 01% the mast, showing the upper bearings Fig. 4, is a side view of the outer end of the boom; Fig, 5, is a plan view of the foot block step; Fig. 6, is a detached plan view of the foot block; Fig. 7, is an inverted plan view,of the same; Fig. 8, is a sectional view of the foot block on the line 88, Fig. 6; Fig. 9, is a detached view of the mast head gudgeon pin; Fig. 1O,

is an end view of the boom; Fig. ll, is a sectio'n'al view on the line 1111, 1g. 4, and Fig. 12, is a sectional plan on the line 1,212,

' Fig. 2.

Referring to Fig. 1 of the drawings, in the present instance, A is a base having sills a of any form desired, and mounted-on the sills is the step casting B forming a bearing for the foot block C to which the mast D is secured. On the upper end of the mast is a gudgeon pin E, which passes through eyes in plates f, secured to the struts F, forming the frame of the derrlck. The boom G is pivotally mounted on the foot block C.

The foot block *step B is made, as clearly shown in Figs. 2, 5 and 12, and has a central opening I), in which rests the gudgeon or plvot head a, which depends from the foot block 0. Projecting upward from the center of the opening is a tapered flange b, which surrounds the central opening 17 for the passage of the re es leading to and from the sheaves H. T ese sheaves are mounted on a pin it carried by brackets 71. depending from the step B. In the annular space surrounding the flange b of the step B is a bearing ring 1:, and the head 0' of the udgeon a rests directly upon this ring. P ates b, b are secured to the step and extend over the flancged head fitting around the neck of the gu eon o, as illustrated in Fig. 2.- These p ates allow the gudgeon to move freely on its bearing'ring, yet prevent it from being withdrawn from the step.

Straps b extend across the 'oints of the lates, as shown in Fig. 12, an the securing olts pass through both the straps and plates, making a very substantial construction.

The foot block has a central opening 0 in line with the opening I), for the passage of the ropes. the gudgeon c is curved, as clearly shown in Fig. 8; the curve running parallel with a line at right angles to'the pivot of the boom. The foot block rests upon the ring In at each side of the center, as illustrated at m, Fig. 8, and at w, m, Fi 7, and as the foot block rocksrwhen the 00m is carrying a load, it

will roll on the ring, the bearing being always at each side of the center line; thus distributing the load on each side of the center, instead of concentrating the load at ghe forward end of the gudgeon, as heretoore.

When the load was concentrated at a single point at the forward end of the gudgeon, the pressure was so great as to cause the head of the gudgeon to crack,

breaking pieces from the head and making the bearing imperfect. I find that by making the head in the form of arocker, the

load is carried by the gudgeon at each side of the-center,'1eaving the forward end practically free from the dead weight of the boom and its load.

Instead'of making a pocket in the foot block, as heretofore, I form a bracket 0 at the rear of the foot block and strengthen it byside flanges 0. to the vertical web 0 of the foot block by bolts (1. By this construction, the lodg- I ment of water at the base of the boom is The underside of the head a of The mast is bolted prevented and the mast is securely held toi made in a single piece and from a forging or'steel casting. It has a body portion, as

through the eyes in the plates f. There is an annular recess at the upper end, in which is mounted a split ring f. The body portion E has flanges e at each side, throu which the securin bolts (1 are passed; said 1 bolts firmly hol mg the gudgeon I to the upper end of the mast. f The boom G is slotted at its lower end to receive the sheave I, which is mounted on a the pivot pin '2', adapted to bearings formed int c cheek pieces a", projecting from the foot block 0. This pivot pin '13 also forms the pivot for the boom G. A sheave is mounted on a transverse pivot pin n.1n aslot near the upper end of the boom. This pivot pin passes through plates n inserted ln the side of the boom, as illustrated in Fig-11. a In order. to strengthen the end of the boom and to provide means for suspending the block formin part of the tackle, and also to form gui es for the rope passing around the sheave N, I provide four angle e bars M, M; arranging two bars M on t upper surface of the boom and two bars M on the lower surface, thereof. The bars'of both sets are spaced apart, as clearly shown in Fi 11, and, as they extend from the end 0 the boom past the sheave end, they act as guides for the rope assing' around said sheave. The bars pro ect beyond the end of the boom as clearly illustrated in Fig. 4, and connecting the two sets of angle 49 bars atthe end is a solid bar P, which extends from one pair of angle bars to the frame, a foot block ste other and is secured thereto y bolts m, m.

The angle bars are secured to the boom bythrough bolts m so that the bars of the 5 upper set are coupled to those of the lowerv bolts and the ends of the bars are set by coupled by the solid bar I.

block having a sheave s, thus'the bloc' 50' is at the extreme end of the boom and the downward pull of this block' is not only taken by the lower angle bars M, but is also taken by the upper angle bars through,

the solid end bar P. v 58 sl spen'dedptrom the block S is the block VT, having a sheave 13, around which passes the ropen.

Secured to the upper bolt m is the block V, having two sheaves 'v, 'v', and mounted on a pin w, passing throughthe openings in the body of the gudgeon E, is a block W,

at E, and a projecting pin .6, which passes:

=pen ad from the boom the head of the ,foot block step ?through which the ropes pass isgeavs and hagingfla recess surrounding :teonin anaan" Hun from the lower bolt "m' is the'pulle g This rope is secured to the", block T and alsoNpasses around the sheave 8 ,w', w. -The rope .y'passes aroun these several sheaves and throu h 0 and Zfi, aroundome, of t e eaves Hatoa power controlled drum. The

5 v. position of: the boom is controlled by the 7 ower mechanism to which the rope y is attached.-

' It'willbe seen b the above construction that I provide a errick which will lift a comparatively hea load" and in which there is no liability of" the lower gudgeon being broken as itis allowed torock in its step; the weight being distributed on each side of thev longitudinal center of the-foot block; the outer end of the boom being also 0 materially strengthened provides a means from which a block can be suspended.

I claim:

1. The combination in a derrick, of a foot block step having a recess therein, a foot block having a gudgeon extending into the recess, a mast secured to the foot block, a boom pivoted to the 'foot block, the lower end of the gudgeon being curved to form a rocker, the curve lyingin-the plane of oscillation of the boom.

2. The combination in a derrick having a mast andboom, of a step, said step having a recess,,a ring mounted within the recess,

a foot block having a gudgeon extending into the recess, a head on the gud eon, the lowerend of the head being curve to form a rocker,'the curve lying in the plane of oscillation of the boom so that said head will rest at each side upon the ring, a mast secured to the foot block, and a boom pivotally mounted on the foot block, the parts bein "so arranged thatiwhen a load is sus- Y gudgeon will rock on the 10:

3. The combination in a derrick, of a base mounted thereon sheaves carried b the oot block step, sai

aving a eentra opening from the projecting om the base of thegrecess,a oose ring moun betweemthe, flange and the wall of the recess, afoot block having an openin in .line

111 with the o ening in the step, a gu geon on the foot b extending into the recess, a

'headon the gudgeon resting on the ring within the recess, plates'secured to. the step extendingoverthe head of the gudgeon, the end of the head being curved so as to form a" rocker,-a-mast secured to the foot block,

and aboom pivotally mounted on the foot block.

4. .The combination in a derrick,-of a foot 12:

-block,$a mast, a boom pivoted to the foot blockv and having a vertical recess near its outer end, a sheave mounted in the recess,

"angle bars arranged longitudinally on each side oft-he recess and on the upperv and of the boom and the other set located on the lower side of the boom, said angle bars being spaced apart, a bar extending across the end of the boom, and bolts connecting the bar to the angle bars.

6. The combination in a derrick, of a boom, two sets of angle bars, one set being arranged longitudinally on the upper side of the boom and the other set being arranged longitudinally'on the underside of the boom, said boom being recessed, a, sheave mounted in the recess and extending between the bars of each set, the bars forming. guides for the ropes passing around the boom, a bar extending across the end of the .the loa boom, bolts connectingfthe said bar with the angle bars, one of the bolts acting as a. pivot for the block around which the hoistmg ropeof the boom passes, the other boltformin the pivot forcthe hoisting block of 7. The combination in a derrick, of a foot block step having. a vrecess therein, a

foot block having-a gudgeon extendin' into the recess, a mast secured. to the footlock, two plates secured to the step and fitting around the gudgeon,. straps' extending over the joints of said plates, and bolts securing both the strapsand plates to the step.

In testimony whereof, I have signed my name to thisspecification, in the presence of two subscribing witnesses. s

, JACOB S. ALLEN. Witnesses: j

WM. E. Snore, WM. A. BARR. 

